Heat motor actuated device



April 1945- H. E. MALONE HEAT MOTOR ACTUATED DEV ICE Filed Jan) 27, 19412 Sheets-Sheet 1 3 I INVENTOR.

Z HumErEHaZunE BY W71. 4: E

pr 10, 1945- H. E. MALONE ,373,130

HEATMOTOR ACTUATED DEVICE Filed Jan. 27, 1941 2 Sheets-Shed 2 159:5 g

vex Q? INVENTOR.

Hams? El -[alums I Patented Apr. 10, 1945 F-FICE 2,373,130 nan MOTORac'rm'rnn navrea Homer E. Malone, Milwaukee, Wis, assignor to llerfexflorporation, Milwaukee, Wis., a cor poration of Wisconsin ApplicationJanuary 21, 1941, Serial No. 376,035

' 16 Claims.

This invention relates generally to control devices and moreparticularly to control devices wherein a heat motor is employed toactuate the device from one control position to another.

The primary object of the invention is to produce a new and improvedheat .motor actuated control device wherein the various elements of thedevice are so formed, arranged and related that a compact, unitarystructur is attained, which device is easy to assemble, operates in apositive and reliable manner, and which provides improved operatingcharacteristics.

Another object of the invention is to provide a heat motor actuateddevice in which the elements thereof are arranged and assembled in anovel manner to produce their most efllcient coaction and in which thecompact unitary structure is symmetrically arranged to present anenhanced appearance when in its supported position.

Heat motor actuated devices are very desirable for use as damperoperators in domestic heating plants, since they are silent inoperation, producing no hum or gear noise, have no fast movingresumption of power is automatically recycled in the event of powerfailure, and which upon and restored to its automatic operation undercontrol of a thermostat for example.

Another object is to provide a strain. release arrangement for a heatmotor actuated damper operator in which the operating bellows isenabledto expand beyond a predetermined point go In the drawings:

check and draft dampers of a furnace in a more efficient and reliablemanner. Another object of the invention is to provide to the bestadvantage in a vertical position upon or adjacent to afurnace.

A further object is to provide a newand improved arrangement of theelements of a heat motor actuated damperv operator in which the damperoperating arm is arranged between the ends of the device while thepressure generator or boiler and the pressure responsiveelement orbellows are arranged at opposite ends of the device.

Another object is to provide an electrical damper operating device forthe draft and check dampers of a furnace in which the draft damper isautomatically closed and .the check damper is opened upon the occurrenceof power failure or any disablement of the device itself.

An additional object of the invention is to provide a damper operatingdevice in which the damper arm may be manuallymoved and latched inposition to cause opening of the draft damper device;

Fig. 1 illustrates a side elevational view of the heat motor damperoperator 1 with a portion broken away;

Fig. 2 is a cross-sectional side view taken along the line 2-2 of Fig.1;

Fig. 3 is a cross-sectional top view taken along the line 33 of Fig. 1;

Fig. 4 is a side view of a portion of the device;

Fig. 5 illustrates diagrammaticaly a heating system embodying a heatmotor damper operator for regulating the temperature of a'room;

Fig. 6 illustrates a modified mounting arrange ment for the damperoperator;

Fig. '7 is a schematic wiring diagram illustrating the circuitconnections for operating the Fig. 8 is a fragmentary portion of thedamper operator showing the position of the parts when the device isoperated manually as during a period of power failure;

Fig. 9 is a fragmentary view showing a modified arrangement providingfor manual operation and automatic recycling; while I Fig. 10 shows anoperated position of the device of Fig. 9.

Although the invention may be embodied in different forms of controlapparatus, the device 3 as shown in the drawings is particularly adaptedfor use as a damper operator for heating plants. In its preferred formthe heat motor actuated device is constructed as a single, compactunitary structure of cylindrical shape and comprising an upper portionindicated generally at 5 containing the so-called ,boiler orelectrically actuated thermal motor, a lower portion indiso that thebellows II is contracted. causing the sleeves 2I and 2I to telescope,and producing an upward movement of the stem II together with the boilerII.

The shells I.and I are connected together by a semicircular metal wallsection 28 bridging the portion I of the device and extending betweenflange portions 21 and 2I formed around the open end of shells I and Irespectively. A num- Io ber of screws a threaded into the wall as andtom wall II preferably solderedthereto. Pro- Jecting centrally from thebottom wall II is a small hollow tube I2. The boiler II is fllled with asuitable volatile fluid II wherein fluid pressure is developed by theheating of the liquid. The liquid is vaporized by means of an electricheater II. several turns of which are wound around the lower portion ofthe boiler III and electrically insulated therefrom by the strip ofinsulating material II. The small tube I2 of the boiler .II is connectedat its other end as by soldering with an operating stem or rod II havingan axial bore therein to provide communication of the liquid from theboiler II to the lower portion of the device. The stem II extendsthrough the portion 1 of the damper operator and is partially guided inits position by means of a flat insulating platel'l arranged at theopenend of the shell I and through which the stem extends. This plate I1also serves as a partition wall isolating and protecting the boiler IIIin the uppershell I from the elements in the intermedate wall portion I.At its lower end the steps II is attached to a plate member II to whichone end of an expansible and contractible pressure responsive device orbellows II is connected as shown. The other end of the bellows II issuitably connected and soldered to a retaining plate sealed in tlfe openend of the shell I.

of the bellows II and the inner'wall of the shell I is completely filledwith the volatile liquid II .whi'ch also fllls up the axial bore of' thestem passing through the flanges 21 and 28 serve to support theseelements in position. As seen more clearly in Figs. 3 and 4, a secondand smaller wall section II is provided in the portion 1 of the deviceand is held to the flanges 21 and II by a pair of ing portion 1 a curvedterminal plate I2 made of .insulating material is provided. Thisterminal plate I2 engages the flanges 21 and 28 and is 20 held in placeby screws II. The terminal plate 2.. space the plates apart. A number ofterminal screws and associated wiring tabs II are arranged centraliy ofthe insulating plate I2 for the purpose of establishingthe electricalconnections to the device. Also arranged upon the 30 insulating plate I2and secured by screws Ii and I5 fllling the devicewith the volatilefluid II the II is a conduit outlet box II for connecting a conduit IIthereto as by means of a pair of locking nuts II.

In order to provide a convenient means for 40 pleted. The fillingoperation is preferably per- I The chamber 2i formed between the outsidewall formed at a slightly elevated temperature value beyond that inwhich the device is arranged' not actuated by the action of the boilerII.

mediate portion 1. Surrounding the lower end of stem II and extendingwithin the bellows II is a guiding sleeve 2I which is fastened at one'end as shown. to the plate 22 and proiects downward toward the movableor operating end of the bellows. A second sleeve member 2I arranged intelescopic relationship to the sleeve 23 is fastened at one end to thebottom end of the stem iii. The purpose of the sleeves II and 2I is toserve as guides for the lower end of the stem II and for the movable endof the bellows. Sleeve II is also provided with an internal abuttingshoulder 2Ia adapted to be engaged by the endof sleeve 2| in order tolimit the contraction movement of the bellows. A strain release coilspring 25 surrounds the lower portion of the stem it within the bellowsII and normally bears against the sleeve 2I.

The arrangement of the foregoing elements is such that the vaporizationof the liquid II in the boiler II by energization of the heater IIforces a portion of the liquid II through the hollow stem II and out ofthe bottom end of the stem I0 is preferably made of two similar piecesof flat The means actuated by the device comprises a damper armindicatedgenerally at II which is positioned in the portion 1 of thedevice between the shell I containing the boiler II and the shell Icontaining the-bellows II, so that the damper arm III issymmetricallyarranged between the ends of the device in a position where itsoperation can be readily correlated with the arrangement of the furnacedampers. The damper arm 00 ported in the intermediate portion 1 of thedevice by means of ear portions II and II formed in the wall plates 26and II respectively as shown in Fig. 4. The portion of the damper arm IIextending through and within the intermediate portion IV of the deviceis provided with slightly oi'fset portions at I! and II to provideclearance for the stem II as shown in Fig. 3. The damper arm II isconnected to the stem I I for operationtlzereby by means of pins I1 andII secured 0 to the oilset portions II and II of the damper arm andloosely and slidably engaging a collar II through which the stem IIextends. The col-.

lar II is arranged loosely on the stem II but is prevented from movingupwardly thereon by means of a split washer- II which is secured toscrews II. To complete the housthe stem is. .In its normal position thestrain release coil spring 25' is in engagement with the lower face ofcollar-49 and the lower end of stem It so that the damper arm 40 is heldin position on the stem solely by the tension stored in spring 25. Withthe damper arm arranged as pointed out, it is seen that upon upwardmovement of A v ermost or draft closing position as shown in Fig.

i, and to provide a means for always restoringthe damper arm to thisposition when, the heat motor is not energized or is disabled, a coilspring M is provided which at one end is connected near the operatingend of the damper 40 and at its other end to a bracket 52 arrangedrigidly on the lower end of the device.

The damper operating device is arranged for secured thereto, while thelower end of shell 9, .as has been pointed out, carries the stud 38..These studs 38 and 53 are adapted tobe engaged by the forked ends of aflat metal supporting bracket 54 which in turn'mayv-be supported as byscrews 55 upon a wall surface as shown in Fig. 1 or the side of afurnace as indicated in Fig- 5. Since the supporting bracket 54 engagesonly the ends of the damperoperator, it may be readily rotated axiallyto position the damper arm 40 in any desired position after-which thelocking nuts 58 and 51 may be tightened to lock the dev'icein its setposition- Another manner in which the damper operator may be supportedin a vertical position is from a ceiling,.for-example, as illustrated inFig. 6. With this arrangement it is necessary that additional bracketmembers 58 and 59 be provided for supporting the device in the positionas shown. By reversing the position of brackets and 59 and placing themon the bottom of the unit, the device maybe supported from a shelf forexample. In all positions of mounting it is essential that the device bearranged verticall with the boiler, III on top so that the elements andliquid l3 will function properly. a

As has been stated, thedevice has been illustrated .for use as a damperoperator arranged to control the operation of a. furnace. As illustratedin Fig. 5, the furnace 60 of conventional form is provided with adraft'damper GI and a stack check'damper 62 which are connected togetherby a chain or. cable 63 in the usual manner,- .the chain passing oversuitable pulleys 64 on the ceiling. The damper operator may be mountedupon the side of thefurnace 60 as shown and isi-arranged with its armprojecting therefrom intc a position ,where connection with the cable63. is most advantageously established as bywmeans of a detachable snapbook 65. The damper operator is usually controlled automatically by-avroom thermostatsuch as 56 in accordance with, the demand for heat in theroom in which the thermostat 66 is located. In order tgprovidepelectrical power for operating the damper operator a step downtransformer 61 is provided having connection with a suitable sourcetacts. As shown in Fig.7 this results in the of commercial power 68. Itis customary in furnace installations toprovide a limit control such asshown at 59 of well known construction to prevent excessive heat outputfrom the furnace 60. The foregoing arrangement represents a typ- 'icalinstallation for a heating plant in which the improved damper operatorof the present invention may be utilized.

. In the normal operation of the damper operator andthe heating plant,assume that the room temperature thermostat 66 functions in response toa dropin temperature to close its conestablishment of an electricalcircuit including the thermostat contacts 66, the secondary winding ofthe transformer til, the limit control switch 69, the terminals 34arranged upon the insulating plate 32 through which the conductors pass,and through the heater winding M of the boiler 60. The current passingthrough the winding 84 causes heating of the volatile liquid id throughthe thin walls of the boiler) so that the liquid within the boiler isgradually volatized and a pressure condition is produced in the boilerchamber which forces the remaining liquid outwardly through the tube 12,the hol-' low portion of the stem 16,. and into the space between theshell Sand the outside of bellows Hi. This action continues until all ofthe liquid is expelled or driven from the boiler ID at which time thishydraulic action upon the bellows ceases since there is no more liquidwithin the boiler that can be vaporized. The arrangement of the heatingwinding l4 upon the lower portion of the boiler l0 insures that all ofthe fluid in the boiler is vaporized and also enables the heat to bedissipated more rapidly through the thin upper walls of the boiler whenthe heater is deenergized. Continued energization of the heater l4 willtherefore .not effect further contraction of the bellows l9 after itreaches a certain stage and the damper arm is fully operated. As thebellows I9 is contracted by the action of the liquid, the stem. I6 isgradually forced vupwardly, causing the boiler l0 likewise to moveupwardly within the shell 8. This upward movement of stem l6 alsoresults in the upward movement of the free end of damper arm 40 aboutits pivot 42 and against the tension exerted by the spring 5| attachedto the damper arm. The movement of the stem l6 likewise results in thetelescoping action of sleeves 23 and 24, serving to guide the lower endof the stem and to hold the movable portion of the bellows in its properposition when contracted. The air within the bellows l9 and surroundingthe sleeves 23,

and 24 is expelled through the openings 22' in the plate 22 when thebellows is contracted so as to introduce no appreciable resistance tothe operation of the device. Since the collar 49 to which the damper arm40 is connected is held upon the stem l8 between the split ring 50 andthe end of the spring 25, the movement of the stem I6 is communicateddirectly to the damper arm 40.

- The upward movement of the damper arm 40 results in the shifting ofthe damper cable 63 so that the draft damper BI is opened and the checkdamper 52 is closed, thereby promoting increased combustion within thefurnace so that Y more heat is propagated into the room in which thethermostat 68 is located. As long as the room thermostat is operated theheater J4 device remains energized. Upon' the damper arm 40 moving toits extreme upper position and engaging the edge of flange 21 on cup Ias indicated in Fig. l, the

bellows i. may continue to be contracted an additional slight amount bythe continued heating of the boiler II by the heater il. Should thisoccur the over-expansion of bellows i9 is ab-' sorbed by the strainrelease spring 25. which upon the further telescoping action of sleevesdevice should become disabled for some reason such as, for example.rupture of the bellows i8. leakage ,of the liquid from the boiler l0, oropen circuiting of the heater it after its energization,

the damper arm ll would not remain stuck in any intermediate positionbut would immediately return toits lowermost position as shown in Fig. 1by the action of .the spring 5i attached to the damper arm. which atall" times biases the damper arm to its lowermost closed position. Whenany such abnormal action occurs the draft damper Oi would be closed andthe check damper it opened so that no dangerous heat conditions would beproduced due to excessive operation of the furnace Iii. It may bepointed out that the tension exerted by the spring 5! upon the damperarm is insuflicient to appreciably affect the reliable operation of thedamper arm by the action of the boiler II and bellows it. Its purpose ismerely to insure that the device will operate to a "fail-safe" conditionwhen the damper operator'no longer functions in the proper manner.

Whenthe room thermostat 86 has been satisfled. it opens its contacts.thereby interrupting the energizing circuit to the heater I. This actioncauses the boiler Iii to immediately begin to cool of! condensing thevapor therein and reducing the pressure in the boiler i0 so that theliquid i-l within the stem i6 and the shell 9 can flow back into theboiler. In order to assist in cooling the boiler it. a series ofapertures are provided within the device including a number of openingsIii in the wall 26. openings II in the insulating plate l1. and openings12 in the top of the shell 8. By this means a "circulation of coolingambient air is' promoted about the outsideof the boiler it to assist inrestoring the liquid to its cool state. The bellows it. due to itsinherent expansion characteristics. forces a portion of the liquid i3out of the chamber 2i, and causes the movement of the stem it to a lowerposition. vcarrying along with it the boiler Hi. This mpvementisassisted somewhat by the action of the biasing spring attached to thedamper ll. When the liquid within the boiler ll reaches a condition ofstability. the motion of the damper arm'is halted. There should besufflcient slack provided in the cable 63 to insure that the draftdamper ii is completely closed and the check damper if is fully openedwhen the furnace is shut down.

Whenever it is necessary to-stoke or ilre the furnace it is usuallydesirable to move the dampers to a position in which both the check anddraft dampers are closed- This may readily be accomplished by removingthe snap buckle I connected to the end of the damper arm II. from itsconnection with the ring on the cable 63. The dampers ti and 02 maythereby be manually shifted by grasping the cable 63, and after thefiring operation isperformed the snap buckle is again connected to'thecable 83 to resume its automatic operation. The invention contemplatessuch a manual control and recycle feature. Referring specifically toFigs. l. 3 and 8, a pivoted latch member I3 is arranged and supportedwithin the intermediate portion 1 of the device by means of a bracket llsupported from the inside of the wall member 28 by means of screws I!and 29. The latch 13 is provided with an oil'set extension which isadapted to function in a manner to close asset of recycle contacts 18supported in insulated relationship upon the supporting bracket 14. Theend of latch 13 is also provided with a trigger portion 11 which isadapted to establish latching relationship with a notched opening 18 cutin the offset portion 48 of damper arm 40. A similarnotchcd portion isformed on the bottom edge oi-the offset portion 46 to coact with thetrigger 11. A manual push button 19 which is spring-pressedoutwardly'and extends through the wall 26 is adapted to engage and movethe lower end of latch 13 when pushed inwardly. v

In the normal operation of the damper operating device and the damperarm 40. the -foregoing elements are arranged in such a manner that theynormally do not' interfere with the operationof the device. However, inthe event that there should be a failure of electrical power. the damperarm as a result would not be moved upwa. dly and the operation of thedevice would not take place automatically under control of thethermostat 66. In this event manual control must be exercised and thismay be performed by manually grasping the lever 40 with one end and thenmoving it upwardly from the lowermost position 40a indicated in Fig. 8to an intermediate position 40b so that the draft damper ll is partiallyopened and the check damper 62 is pa. tially closed. At the same timethat damper v arm 40 is operated the manual push button ll must bepressed inwardly. This swings the trigger end 11 of latch 13 intoengagement with the notch I8 of the damper arm 40 and holds the damperarm in its set position. The trigger l1 and notch is are so arrangedthat when the pressure upon the push button 19 is removed. the elements11 and 18 remain lockedin engagement. as illustrated in Fig. 8. Thislatch ng action is further assisted by the tension exerted by thebiasing coil spring 5i. The operating movement of the latching member 13also causes thevclosure of the recycle contacts '16, but since currentis notinow available no action occurs. This position of the arm 40provides for a moderate amount of heat from the furnace by manualcontrol during a period of power-'i'ailure. If more heat is necessarythe damper arm 40 may be moved to its full upward position. as indicatedat tile in Fig. 8, to induce maximum draft condiward slightly.. Thisaction enables the trigger TI to disengage itself from the damper armandv under the tension stored in recycle contacts 16 the latch member.13 is moved outwardly, This permits the damper arm 40 to be lowered todraft closing position. If the damper arm is latched as, above describedupon the resumption of electrical power, the recycle contacts 16, whichas illustrated in Fig. '7 are in shunt of the room thermostat 66, willestablish an energizing circuit for the heater winding l4, independentof the room thermostat. Thisaction will cause movement of the damperoperator and arm '48. toward its upward or full damper opening position400 resulting-in the unlatching of latching lever 13 in the mannerpointed out and the restoration of the device from manual control toautomatic control by the room thermostat. As soon as the latch 13 isdisconnected from the damper arm 40 the recycle contacts 16 areautomatically opened. It should be noted that whenever the damper arm isoperated manually the bellows 9 will be compressed by the upwardmovement of the stem IE, but this action will have no' effect whateverupon the volatile liquid within the system except to cause some of it topass out from the boiler l through the stem I6.

In the event that where it is in engagement with either the notch 84 ornotch 85, depending on how far upward the damper is moved, the firstposition .in notch 84 being the intermediate or stoking position 40b ofthe damper arm and the second position in notch 85 being the wide openposition. The tension of spring 5| is sufficient to maintain theend oflatch 80 in the notch 84 as long as no power is on the device. However.upon the resumption of electrical service the broiler heater is againenergized by the room thermostat to compress the bellows,

forcing the damper arm 40 slightly farther in an upward direction asillustrated in Fig. 9 at 40d.

. This further upward movement of the damper arm results in releasingthe end of latch 80 from notch 84 or 85 so that the tension stored inspring 83 will exert itself. to move the latch 8|) to the normalposition shown in Fig. 9-. In this embodiment of the invention the roomthermostat effects complete control over the damper operating deviceupon the resumption of power and no recycle contacts 18 are employed asin Fig. 8.

From the foregoing description it is seen that a newand improved heatmotor actuated device has been devised which presents an enhancedsymmetrical appearance, is simple in its operation and in the number ofelements comprising If desired, the intermediate latched position 48b ofarm may also be utilized fora stoking position, the chain 63 beingarranged so that the dampers 6| and 62 are both closed when the arm isin-this position. Due to the recycling contact being closed at thistime,the heater l4 will be energized, thus tending to cause the regulator toreturn to automatic control. However, as an ap preciable time lag occursbetween energization of the heater H and movement of the damper arm 40,a period is providedduring which the furnace may be stoked with bothdampers closed.

Under certain conditions it may not be desirable to employ the fullyautomatic recycle feature on the damper operating device but to controlthe same directly from the room thermostat instead of the recyclecontacts 16. Such an arrangement is disclosed in the modified form'ofthe invention illustrated in Figs. 9 and 10. In this arrangement alatching lever 80 is provided which is pivoted by a pin 8| supportedfrom a bracket 82 mounted on the side of the damper device. The latch 80is biased to the normal or unlatched position shown in Fig. 9 by meansof a torsion spring 83 having one end bearing against the latch 80 andthe other end against the side of the the intermediate portionencircling the pivot pin 8|. In this arrangementthe damper arm 40 isalso provided with a pair of latching notches 84 and 85.

casing of the device,

In the foregoing arrangement upon the discon the same, embodies improvedoperating characteristics, and is readily adapted for universalmounting. The invention is capable of embodiment in various other forms,in additionto those illustrated and described. It is therefore to beunderstood that the same is not to be restricted to the preciseembodiment disclosed but only to the extent of the scope of the appendedclaims. What is claimed is:

i. In a heat motor actuated device, a unitary structure comprising anupstanding elongated casing enclosing a pressure generator arranged atthe upper end portion thereof, a pressure responsive element arranged atthe lower end portion of said casing, a connection between thepressuregenerator and pressure responsive element whereby the latter is operatedby the pressure generator, and an actuating arm actuated by the pressureresponsive element and' arranged between the pressure generator and thepressure responsive element, said actuating arm extending. from saidcasing at a point midway between the end portions thereof.

2. In a heat motor actuated device, a unitary structure comprising .anelongated casing formed of oppositely disposed shell portions and anintermediate wall portion connecting said shell portions, at pressuregenerator arranged within ,one of said 'shell'portions, a pressureresponsive element arranged within the other of said shell portions, aconnection between the pressure generator and pressure responsiveelement whereby the latter is operated by the pressure generator, and anactuating arm actuated by said pressure responsive element and arrangedin said intermediate wall portion to project outwardly from saidelongated casing between the ends thereof.

3. In a heat motor actuated device, a unitary structure comprising anelongated casing formed of oppositely disposed shell portions and anintermediate wall portion connecting said shell portions, a pressuregenerator arranged within one of said shell portions, a ment arrangedwithin the other of said shell ar" tions, a connection between thepressure generator and pressure responsive element whereby the latter isoperated by the pressure generator,

pressure responsive els 1' an actuating arm actuated by said pressureresponsive element and arranged in said intermediate wall portion toproject outwardly from said elongated casing between the ends thereof,and means for supporting said elongated casing from the outer ends ofeach shell portion whereby said elongated casing is adapted to beaxially rotated to shift the actuating arm to any desired position.

4. In a heat motor actuated device, a unitary structure comprising anelongated casing including oppositely disposed shell portions and-anintermediate wall portion connecting the shell' portions, a separatepartition wall separating the interior of each of said shell portionsfrom the interior of the intermediate wall portion, a pressure generatorarranged within one of the shell portions, a pressure responsive elementarranged within the other'oi said shell portions, a conneotion betweenthe pressure generator and pressure responsive element whereby thelatter is operated by the pressure generator, and an actuating armactuated by said pressure responsive element and arranged in saidintermediate wall portion, said actuating arm projecting cutwardly fromsaid intermediate wall portion and being isolated by said partitionwalls from said pressure generator and said pressure responsive element,

5. In a heat motor actuated device, a unitary structure comprisingan'el'ongated casing includa,e7s,1so

its operating movement by said partition walls, t I 1 diate wall portionand having its other end movand an actuating arm pivoted to saidintermediate wall portion between said partition walls and actuated bysaid operating stew, said actuating arm projecting outwardly throughsaid intermeable in a direction parallel to the axis oi the elongatedcasing. 4 'I'. In a heat motor actuated device, an outside casing, apressure generator, a pressure responsive element below and spaced fromsaid pressure generator, said pressure responsive element having a fixedwall portion partly forming said outside casing, and a movable wallportion, an operating stem connected to the movable wall portion or saidpressure responsiveelement and' extending toward said pressuregenerator, an actuating arm located in the space between said' pressuregenerator and said pressure responsive element, said arm extendingthrough said casing and associated with said operating stem foractuation thereby, said actuating arm extending laterally of said vpressure responsive element;

' and means. for establishing fluid communication ing oppositelydisposed shell portions and an-intermediate wall portion connecting theshell portions, separate partition walls separating the interior of'eachof said shell portions from the interior of the intermediate wallportion, a pressure generator arranged within one of said shellportions, 9, pressure responsive element arranged within the other ofsaid shell portions, an operating stem connecting said pressuregenerator with said pressure responsive element, and plac ing theirinteriors in communication, said 'op-' eratlng stem extending axiallyacross said intermediate wall portion and through said partition walls,said operating stem being operated by said pressure responsive elementin response to pressure variations produced by said pressure generator,and an actuating arm in said intermediate wall portion and between saidpartition walls, said actuating arm projecting outwardly through saidintermediate wall portion and being operated by said operating stem in adirection parallel to the longitudinal axis of said casing. i

6. In a heat motor actuated device, a unitary structure comprising anelongated casing including oppositely disposed shell portions and anintermediate wall portion connecting .the shell portions, separatepartition walls separating the interior of each of said shell portionsfrom the interior of the intermediate wall portion, a pressure generatorarranged within one of said shell portions, a pressure responsiveelement arranged within the other of said shell portions, an operatingstern connecting said pressure generator with said pressure responsiveelementand placing their interiors in communication, said operating stemextending through said partition walls and across said intermediate wallportion, said pressure generator, said pressure responsive element andsaid operating stem all being arranged in axial alignment within saidelongated casing, sa d operating stem being actuated by said pressureresponsive element in response to pressure variations produced by saidpressure generatpr and being guided and supported in between saidpressure generator and said pressure responsive element.

8. In a heat motor actuated device, a pressure generator, a pressureresponsive element located below the pressure generator and having amovable portion and a fixed portion, anoperating stem connecting saidpressure generator with the movable portion or said pressure responsiveelement, said operating stem placing the interiors of the pressuregenerator and the. pressure "responsive. element in communication, meansfor supporting the fixed portion of said pressure responsive element,means for producing pressure variations in said pressure generator tooperate said pressure responsive element whereby said operating stem andsaid pressure generator are both shifted with respect to the supportedportion oi said pressure responsive element, an operating memberarranged for actuation by said operating stem, an actuating arm operatedby said operating member, and a strain release spring extending betweensaid operating member and the movable portion or said pressureresponsive element whereby said pressure responsive element can continueto be operated by said pressure generator after said actuating arm hasbeen fully operated.

9. In a heat motor actuated device, a pressure generator, a pressureresponsive element having a movable end and a fixed end, an operatingstem connecting said pressure generator with the movable end of saidpressure responsive element, said operating stem placing the interiorsof the pressure generator and pressure responsive element incommunication, said pressure generator, said pressure responsive elementand said operating stem being all arranged in axial alignment, means forsupporting the fixed end or said 7 5 to operate said pressure responsiveelement whereby said operating stem and said pressure generator are'both shifted axially with respect to the supported end oi said pressureresponsive element, an operating member arranged upon said operatingstem and operated .i'rom one position to another by the movement of saidoperating stem, an actuating-arm operated by said operating member, astrain release springior holding said operating member in position uponsaid operating stem, said strain release spring ar- 13. n; a s m heatmotor actuateddevice, an elongated outside casing, a pressure generatorin 10. In a fluid heat motor actuated device," a

pressure generator, a pressure responsive element comprising a bellowshaving a fixed wall at one end and a movable wall on the other end andbeing spaced from said pressure generator, an

- operating stem connecting said pressure generator with the movablewall of said bellows, said operating stem passing axially through saidbellows to the movable wall thereof. a pressure chamber. surroundingsaid bellows, said operating stem having an opening therein'forestablishing fluid pressure communication between said pressuregenerator and said pressure chamber, means whereby the movable wall ofsaid bellows is actuated by the operation of said pressure generator toshift said operating stem and said pressure generator, and telescopingmeans connected to the movable and fixed walls of said bellows forguiding-and sup orting the operating stem in its axial movement.

11. A heat motor actuated device comprising a unitary structure of asubstantially cylindrical elongated shape including oppositely disposedsaid casing at one end thereof, a bellows in said casing at the otherend thereof and havingits axis parallel to the long dimension of saidcasing, a cup-shaped member forming a portion of said outside casing,said cup-shaped member surrounding said bellows and being spacedtherefrom, thebellows being closed at its end adjacent the bottom ofsaid cup-shaped member and e having its other end secured ina fluidtight shell portions and an intermediate wall portion outwardly fromsaid intermediate wall portion, J

to shift the actuating arm in any desired rotary position.

12. In a heat motor actuated device, an elongated casing, anelectrically operated pressure generator arranged at one end of saidcasing, a pressure responsive element arranged at the other'end of saidcasing and spaced from sat-f.

. pressure generator, a connnection between the pressure generator andpressure responsive element whereby the latter is operated by theformer, an operating arm extending laterally of said casing in the spacebetween the pressure generator and pressure responsive element, saidoperating arm being actuated by said pressure responsive element inresponse to pressure variations produced by said pressure generator,manually operated means arranged in the space between the pressuregenerator and. pressure responsive element for lockingsaid operating armin an operatedposition in the event of electrical I power failure ofsaid pressure generator, and

means also arranged in said space for automatii cally reoperating saidpressure generator and releasing said operating arm upon the resumptionof electrical power.

manner to-said cup-shaped member, a connection between the pressuregenerator and the space between the cup-shaped member and bellowswhereby the bellows is operated by the pressure generator, an actuatingarm projecting through said outside casing between the pressuregenerator and bellows, and means actuated by said bellows for actuatingsaid'actuating arm.

14. In a fluid heat motor actuated device, an elongated outside casing,a pressure, generator in said casing at one end thereof, a bellows insaid casing at the other end thereof and having its axis parallel to thelong dimension of 'said pasing, a cup-shaped member forming a portion ofsaid outside casing, said cup-shaped member surrounding said bellows andbeing spaced therefrom, the bellows being closed at its end adjacent thebottom of said cup-shaped member and having its other end secured in afluid tight manner to said cup-shaped member, a hollow operating stemconnected to the closed end of the bellows and to the generator, saidoperating stem ing through the casing between the pressure generator andbellows.

15. In a heat motor, an upstanding elongated casing, a pressuregenerator located in the upper portion of the casing. a pressureresponsive element located in the lower portion of the casing, a conduitextending from the lower portion of the pressure generator to thepressure responsive element whereby the latter is operated by thepressure generator, a lever arm extending from the interior of thecasing to the exterior thereof and also extending between the pressuregenerator and pressure responsive element, said lever arm being actuatedby the pressure responsive element. 1

16. In a heat motor, an upstanding elongated casing, a pressuregenerator located in the upper portion of the casing, a pressureresponsive element located in the lower portion of the casing, a hollowoperating stem extending from the lower portion of the pressuregenerator to a movable portion of the pressure responsive elementwhereby the latter is operated by the pressure generator and causesmovement of said stem, a lever by said stem. HOMER E. MALONE.

I csmricm: or commoner, v Potent No. 2,575,1 0. 7 r 1.0, 191;;

, J rim-n. muons.

i It is hereby certifledtl'xat error sppee'frs in the printedspecification or the above mnnbered potent requiring correction asfollows: Page 2 first column, line 35, for the word. st cps" reed-stein--; page 3, second column,11ne llfafter rocm strikecvotftenipersture h. pogo h, seconn cclumn,. 11nd 50, for "end" reed--he.n d--; page 5,. second column, line 10,

for "broiler" reed --bc11er--; pege ,6, second 0011mm, line 14., 6mm 6,J

for "stew" rend --stem--- and thet the said Letters Potent should beread! I with this correotibntherein'thdtthe same-my conrom to the recordor the case in the Patent ogrzeq.

i Signed and seeled this 71:11 as or August, A. n. 1915.

Leslie Fraz er (Seal) Acting camissioner of Patents. 7

